Finding the Fourth Proportional to 6,207.78, 8,566.72 and 3,555.20

Step by Step Solution

1. Step 1: Write the proportion equation
   6,207.78 : 8,566.72 = 3,555.20 : x
2. Step 2: Convert to fraction form
   6,207.78/8,566.72 = 3,555.20/x
3. Step 3: Cross multiply
   6,207.78x = 8,566.72 × 3,555.20
4. Step 4: Simplify right side
   6,207.78x = 30,456,402.94
5. Step 5: Solve for x
   x = 30,456,402.94/6,207.78
6. Step 6: Final answer
   x = 4,906.17